(CNN) — The Indianapolis Colts announced Saturday that Philip Rivers has been signed to the team’s 53-man active roster ahead of a Sunday showdown against the Seattle Seahawks.

The 44-year-old Rivers joined the Colts’ practice squad earlier in the week following a season-ending injury to starting quarterback Daniel Jones.

Multiple NFL insiders are reporting that Rivers will start the game under center for Indianapolis, but the Colts are playing it close to the vest for now.

“Our team won’t officially announce a starter before kickoff tomorrow,” Colts spokesman Matt Conti told CNN on Saturday.

Rivers retired from the NFL in January 2021, after 17 seasons in the league, having spent his final year with the Colts during a challenging Covid-19 season.

“I had not given any thought of

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